by Kastro
Paper/Archive/CVE-2026-103264

CVE-2026-103264

fleetdm fleet — Fleet before 4.87.0 Authentication Bypass via Device Identifiers

EPSS 0.3%CVSS 9.3
critical.is priorityof 100
33
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 24.0.240 × 204.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Fleet versions before 4.87.0 contain an authentication bypass vulnerability in the device API that accepts hostnames and hardware serials as authentication tokens in addition to device UUIDs. Unauthenticated attackers who know or guess these non-secret identifiers can authenticate as iOS/iPadOS hosts to read device data and trigger device-scoped actions including software installation and MDM migration.

Affected

ProductAffectedFixed inSource
fleet< 4.87.04.87.0CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
VulnCheck (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorygithub.com/fleetdm/fleet/security/advisories/GHSA-vrc8-2wcx-327fwriteupvulncheck.com/advisories/fleet-before-4.87.0-authentication-bypass-via-device-identifiers